Hunger and poverty are the root causes of much of the world's unrest and misery.
饥饿和贫困是世界上许多动荡和苦难的根本原因。
The most profound ideas in mathematics often come from asking the simplest questions.
The art of the past is being mystified because a privileged minority is striving to invent a history which can retrospectively justify the role of the ruling class.